Of the ones I've tried, I had thought that the DBA Soundwave Breakdown had it - and no question that it can hold a full-bodied, creamy textured note for a long time. But I just tried a Soda Meiser, and though it lacks a little in the tonal fullness department, it can really zero in on those tail end string vibrations and it sustains a good few seconds longer than the DBA... amazing stuff. What's your strum-a-chord-leave-the-guitar-on-its-stand-and-go-have-a-pint fuzz? EDIT: I was initially thinking of fuzzes that can 'go long' without the help of acoustic feedback from the amp (think small pub/coffee-shop gig / recording at home). But others might be interested in fuzz that can go to infinity and beyond (and still stay smooth) with the help of the amp - so, whichever.